|Publication number||US7117640 B2|
|Application number||US 10/315,471|
|Publication date||Oct 10, 2006|
|Filing date||Dec 10, 2002|
|Priority date||Oct 31, 2000|
|Also published as||US6519899, US20030167697|
|Publication number||10315471, 315471, US 7117640 B2, US 7117640B2, US-B2-7117640, US7117640 B2, US7117640B2|
|Original Assignee||Imedco Ag|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (82), Non-Patent Citations (20), Referenced by (7), Classifications (12), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of and claims the benefit of priority to U.S. patent application Ser. No. 09/702,454, filed Oct. 31, 2000 now U.S. Pat. No. 6,514,899.
This invention relates in general to a radio frequency (“RF”) shielded and acoustically insulated door for shielding enclosures, and more particularly to a RF shielded and acoustically insulated door which improves the attenuation characteristics of the RF shielded room and improves the acoustic insulation of equipment therein.
The power of magnetic resonance imaging (“MRI”) equipment is continually increasing to meet the demand in the medical community for better and faster images. However, as the power of MRI equipment increases, an increased amount or level of audible noise is generated due, in part, to the coil assembly of the MRI equipment. As a result, the level of noise may increase to the extent that it exceeds health and safety regulatory and industry standards which seek to protect the worker from increased noise levels. Such MRI equipment must, therefore, be properly contained within a RF shielded and acoustically insulated room to protect the MRI equipment from stray electromagnetic radiation and to protect the medical staff or operators of the equipment from continuous undesirable noise levels.
An important feature of the RF shielded and acoustically insulated room is the door. While having to fulfill its primary task of shielding RF fields and insulating noise, the door must also be easy to operate, durable and aesthetically pleasing to operators and patients. Attempts have been made to address the problem of providing a door which acts to shield RF fields and insulate noise without compromising its performance. For example, U.S. Pat. No. 4,794,206 to Industrial Acoustics Company, Inc. is directed to a room that is RF shielded and acoustically insulated. The room includes a door that is acoustically sealed by acoustic seals associated the door frame.
It is desirable to provide improved RF shielded and acoustically insulated doors which have higher attenuation characteristics and better noise insulation capabilities.
The present invention provides an improved door construction for a RF shielded and acoustically insulated room. In general, the door includes a door frame and door panel that is pivotally and conductively connected to the door frame. The door panel includes outer sections and a noise absorbing material that is disposed between the outer sections such that the door panel provides greater acoustic insulation. The acoustic insulating properties of the door panel are further enhanced by a noise insulating gap.
The frame includes a frame noise absorbing material and a frame perforated region. The frame perforated region includes a number of apertures or perforations that are adjacent to the frame noise absorbing material for enabling sound to more easily pass through this region and be absorbed by the noise absorbing material.
The coaction between the acoustically insulating properties of the door frame and door panel effectively enhance the overall acoustic insulating capabilities of the door.
It is therefore an object of the present invention to provide a RF shielded and acoustically insulated door for a RF shielded room.
Other objects, features and advantages of the present invention will be apparent from the following detailed disclosure, taken in conjunction with the accompanying sheets of drawings, wherein like reference numerals refer to like parts, elements or components.
Referring now to the drawings, and particularly to
As shown in
While the door 10 is a critical component of the acoustical noise insulated and RF shielded room 12, other components, such as, the walls 30, ceiling 32, floor 34 and windows 36, are also necessary to ensure that the room 12 effectively shields RF fields and insulates noise. In general, the floor 34 supports the walls 30 which support the ceiling 32. The room 12 can be of a variety of different constructions and configurations including a number of different sizes and dimensions.
For example, the RF shielded and noise insulated room 12 is preferably constructed for housing MRI equipment (not shown). However, the room 12 can be configured to house a variety of other equipment, such as scientific and data processing equipment which require protection from stray electromagnetic radiation.
To protect the equipment from stray electromagnetic radiation, the room 12 includes a RF shield layer 38 of a conductive material so as to provide RF shielding. This material is metal, and preferably copper. The room 12 also includes an acoustic noise insulation layer 40. The acoustic noise insulation layer 40 can include a variety of different and suitable acoustic noise insulating materials as further discussed below. The room 12 further includes windows 36 of any suitable size and location for monitoring the equipment in the room or enclosure 12. The windows 36 are spaced at various locations along the walls 30 as further illustrated in
As previously discussed, the door 10 is shown in the open position as it hangs from its frame 16 as shown in
In the closed position (not shown), a base 46 of the door 10 is flush to a threshold of the door frame 16. The threshold is preferably configured such that it has a inclined or angled region (as illustrated in
The door panel 14 preferably has a rectangular shape with a door width, door length, first side section 50, second side section 52, top section 54, and bottom section 56. The door panel 14 can be constructed in a variety of different sizes and shapes to conform to the size and dimension of the room 12. The door panel 14 preferably has a sandwich or layered design so as to effectively shield RF fields and insulate noise as described below (and illustrated in
The door frame 16 shape and size is only limited to the extent that the door 10 can be properly attached to the room 12 so that it easily operates, insulates noise, and provides RF shielding. The door frame 16 preferably has four door frame sections. It has first side section 58 and second side section 60 that each span a length of the door frame 16 and a top 62 and base 46 or threshold section that each span a length of the door frame 16. The top section 62, first side section 58 and second side section 60 each include a door frame noise absorbing material 20 (as illustrated in
As further illustrated in
The first side section 58 and the second side section 60 of the door frame 16 each include a perforated region 22 extending along a portion of the first side section 58 and the second side section 60, preferably the entire length. The perforated region 22 defines a plurality of apertures 66 spaced apart at various distances so as to effectively facilitate noise absorption and insulation as discussed below. The spaced distances preferably vary as between the first regions and the second regions as discussed below. The top section 62 of the door frame 16 also includes a perforated region 22 defining a plurality of apertures 66 as further discussed below.
Within the spaced region 76 of the door panel 14, the door panel noise absorbing layer 18 preferably includes a single layer that is adjacent to the first outer section 68 of the door panel 14. However, the present invention can include a second or additional noise absorbing layers (not shown) adjacent to the second outer section 70. The door panel noise absorbing layer 18 preferably has a thickness of 5 mm and extends along the entire length of the spaced region 76 as defined by the outer sections and side members of the door panel 14. In addition, the door panel noise absorbing layer 18 preferably is a fully bonded insulation foil which is relatively heavy in weight in order to effectively insulate noise.
A cavity 78 of preferably 40 mm in width is adjacent to the door panel noise absorbing layer 18. The cavity 78 contains an amount of insulating material 80 of mineral wool pads, preferably FLUMROC Type 1, a type of rockwool, having a thickness of 30 mm. The added insulating material 80 is further utilized to insulate noise.
Adjacent to the second outer section 70, a layer of conductive material 82 preferably extends along the length of the second outer section 70. This conductive material layer 82 has a first end 84 and second end 86 that each wrap around a portion of a respective side member of the door panel 14 so as to facilitate the RF shielding attenuation of the door. The conductive material layer 82 is preferably copper and has a thickness ranging from 0.14 to 0.21 mm.
A number of spacers 88 are utilized to attach the second outer section 70 to the conductive material layer 82 which wraps around a portion of each of the side members of the door panel as previously discussed. Two spacers are preferably positioned on a section of the conductive material layer 82 adjacent to each of the side members of the door panel 14. Each of the two spacers are preferably spaced apart at a distance of 250 mm between the centers of the spacers. Each of the spacers 88 is preferably made of a PVC material and has dimensions of 0.30×10×2.5 mm.
This configuration, i.e., the second outer section 70 in contact with the conductive material layer 82 via the spacers 88, defines a noise insulating gap 89 in order to further enhance the acoustically insulating properties of the door panel 14. The noise insulating gap 89 acts as a barrier for noise that is transmitted between the first outer section 68 and the second outer section 70 of the door panel. The acoustic noise insulating gap 89 is preferably an air insulating gap of 2.5 mm as defined by the preferred thickness of each of the spacers 88 as previously discussed.
However, the present invention is not limited to the size, shape and material of the spacers 88 and can include spacers 88 of a variety of different sizes, shapes and suitable materials.
In order to provide continuous RF shielding between the door panel 14 and frame 16, a number of RF shielding contact members 90 or fingers are flexibly mounted onto each of the top section and bottom section of the door panel 14 as shown in
As previously discussed, the door frame 16 includes a perforated region 22 defining a plurality of apertures 66 and extending along the top section 62, first side section 58 and second side section 60 of the door frame. As shown in
In an alternative embodiment as shown in
It should be appreciated that the door panel 14 can be pivotally attached to either of the first side section 58 (as shown in
As shown in
In addition to the acoustic noise absorbing layers of the door panel 14 and door frame 16, the present invention also includes a number of seal members that can act in series so as to further insulate the gap regions between the door panel 14 and door frame 16 such that noise does not escape from the gap regions and into the outside environment. Regarding the gap 108 between the top sections of the door panel 14 and door frame 16, a first seal member 110 is attached to the door frame 16 such that the gap 108 between the door panel 14 and door frame 16 section is effectively closed. The gap 108 preferably extends a distance 112 of 4.5 mm. The first seal member 110 is preferably an adhesive rubber seal Type MAAG EPM P-Profil with dimensions of 9×5.5 mm.
In the gap region 114 between the bottom sections of the door frame 16 and panel 14, a second seal member 116 acts to insulate the gap 114 from noise. The gap 114 preferably has a distance 118 of 10 mm between the bottom sections of the door panel 14 and door frame 16 at an inclined region 119 of the threshold 64. The gap 114 varies in distance across the threshold 64 and has a preferable distance 124 of 5.5 mm at an end opposite of the inclined region 119. The second seal 116 member is preferably a felt material with dimensions of 15×5 mm. However, the first seal member 110 and second seal member 116 can be made of a variety of materials and located in a variety of different positions so as to effectively seal and insulate the gap regions between the door frame 16 and panel 14. For example, the seal member 110 and the seal member 116 can form a seamless seal around at least a portion of the door.
In addition to the first seal member 110 and second seal member 116, the present invention includes a third seal member 117 that is attached to an outer surface 120 of the door panel 14. The third seal member 117 includes an angled member 121 that has an arm which preferably is directed to the bottom of the door frame 16. The angled member 121 is preferably a brass material and has dimensions of 25×10×2 mm. The third seal member 117 further includes a scrapper seal member 122 that is attached to a spacer member 125 of the angled member 121 and to the outer surface so as to effectively secure the scrapper seal member 122. The scrapper seal member 122 includes a gasket member 126 that extends to and contacts the bottom of the door frame 16. The scrapper seal member 122 is preferably a seal Type HEBCO. A further seal member 133 can be attached to the door panel 14 which can also provide a seamless seal around the door.
As further illustrated in
The door frame 16 includes a conductive material 129 to further facilitate the conductive connection between the door frame 16 and door panel 14. The conductive material 129 is attached to each of the four sides of the door frame 16. As shown in
As further illustrated in
As further illustrated in
As shown in
The present invention is not limited to the size, shape, dimension and material make-up of the previously discussed components of the door 10, i.e., the first outer section 68 and the section outer section 70 of the door panel 14. A variety of different materials of varying sizes and shapes may be utilized to effectively provide both RF shielding and acoustic insulation. Although a variety of different materials may be utilized, the inventor has discovered that materials heavier in weight than other like materials are more preferable because the heavy-weighted materials provide enhanced acoustic insulation relative to the light-weighted materials.
For example, the outer sections of the door panel 14 are preferably made of plywood as previously discussed. However, the outer sections of the door panel 14 may also be made of a chipboard material provided that the weight of the chipboard material is comparable to that of plywood. The weight of the chipboard material can be varied, for example, by varying the amount of glue that is utilized to make the material. The weight of the chipboard increases with an increased amount of glue.
By increasing the weight of the chipboard to a weight that is heavier than plywood or other light-weighted chipboard of the same size and shape, it should be appreciated that the heavier-weighted chipboard is more preferable than the plywood or other light-weighted chipboard because of its enhanced effect on the acoustic insulating properties of the door 10 due to its increased weight. It should also be appreciated that the acoustic insulating characteristics of the door can be adjusted by varying the other materials, and dimensions thereof.
It should be appreciated that the present invention is not limited to the size, dimension and location of the apertures 66 of the perforated region 22. The apertures 66 can include a variety of different sizes, shapes and locations in order to facilitate the acoustic insulating properties of the door 10.
The assignee of the present invention conducted noise insulation performance tests on a prototype of the door of the present invention. In order to determine the noise insulation effectiveness of the door, the entire door assembly was mounted in an opening between two laboratories, i.e., the transmitter and receiver rooms. The dimensions of the opening were 2000×900 mm. The junction between the door assembly and the edges of the opening was sealed with putty. Alternative routes for noise to be transferred between the transmitter and receiver rooms were sufficiently attenuated to make their influence on the results insignificant.
To measure the suppression of airborne noise, a loudspeaker in the transmitter room transmitted noise in thirds in a frequency range of 80 Hz to 5000 Hz. The noise levels L1 in the transmitter room and L2 in the receiver room were measured using a high-precision noise level meter. A condenser microphone which was moved through the room acted as a converter.
A noise suppression R according to ISO 717-1982 was calculated from the following formula:
R=L1−L2+10 log (S/A2) (dB)
L1 represents airborne noise level in the transmitter room (dB); L2 represents airborne noise levels in the receiver room (dB); S represents the area of the door under test (m2); and A2 represents the equivalent noise absorbing area of the receiver room (m2).
The performance test results are depicted in graphical form 160 in
Noise Suppression R′ (dB)
The performance test results demonstrate the effectiveness of the acoustically insulating capabilities of the door of the present invention. As previously discussed, the door's acoustically insulating capabilities are effectively enhanced by the coaction of the acoustically insulating properties of the door panel and door frame.
It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention, and it is understood that this application is to be limited only by the scope of the appended claims.
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|U.S. Classification||49/501, 52/784.1|
|International Classification||E06B5/18, H05K9/00, E06B3/00, E06B5/20|
|Cooperative Classification||E06B5/20, H05K9/0001, E06B5/18|
|European Classification||H05K9/00A, E06B5/18, E06B5/20|
|Dec 10, 2002||AS||Assignment|
Owner name: IMEDCO AG, SWITZERLAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HURZELER, PETER;REEL/FRAME:013569/0072
Effective date: 20010402
|Mar 12, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Feb 13, 2014||FPAY||Fee payment|
Year of fee payment: 8